"For the past several months, access to Dota 2 has been granted through a queue system that gated entry into the community," reads a post on the game's official blog.

"We've used this system to gradually increase the size of our playerbase, as we ramped up our infrastructure and improved the experience for new players.

"As we have recently completed a set of server management upgrades as well as released a huge number of enhancements to the new user experience, we're going to remove all restrictions to playing Dota 2."

Users will no longer be required to sign-up to join the game's 6.5 million monthly users.

The post continues: "If you have a friend who hasn't tried Dota 2 yet, be sure to take advantage of the new recruitment feature to get additional bonuses for both you and your friend."

Available through Steam, Dota 2 is a free-to-play multiplayer online battle arena game.

It was recently updated with the GLaDOS announcer pack, which added a number of Portal-themed items to the in-game store.